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Nakamichi CDC-4A Laser Focus Coil -10V after new power supply Caps
Nakamichi CDC-4A Laser Focus Coil -10V after new power supply Caps
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Old 12th November 2019, 04:34 AM   #41
markos4553 is offline markos4553  United States
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Quote:
Originally Posted by markos4553 View Post
R118= 1.006 Kohms should be 1 Kohms
R119= 5.699 Kohms should be 1 Kohms



In the above post R118 and R119 are transposed with an error in the "should be....."


R118= 5.699 Kohms should be 5.6 Kohms
R119= 1.006 Kohms should be 1 Kohms


Sorry!


Mark K.

Last edited by markos4553; 12th November 2019 at 04:36 AM.
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Old 14th November 2019, 10:01 PM   #42
Salar is offline Salar  Germany
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There shouldnīt be nothing wrong with the real worls values against the thoretical values from the schematic. I guess they are o.k. As I mentioned before, are there transistors -that amplify he signal - in the singnal path to the coils?
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Old 15th November 2019, 04:14 AM   #43
anatech is offline anatech  Canada
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Nakamichi CDC-4A Laser Focus Coil -10V after new power supply Caps
Hi Mark,
Depending on what equipment you are using to measure capacitance and resistance, a few components seem to be out of tolerance or close to it. This is unusual these days, so you should have a second look at them. I don't think they would cause your problem, but the readings you have might point to a problem with the part. So the parts to recheck are:
R108
R110
R116
R118
C136
As for the fault you are seeing, if I had to point my finger at a chip, it would be IC101 for sure. I have had to replace them in the past, but this is a rare occurrence. I have fixed a lot of Sony based CD players in my time. I wouldn't be pointing my finger at a chip just yet. Have you cleaned the PCB carefully in the area of IC101? Leakage current could really throw things off in the servo. The last chemical to hit that board should be a no residue type cleaner.

-Chris
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Old 15th November 2019, 04:31 AM   #44
markos4553 is offline markos4553  United States
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Hey Chris,


Thank you for the suggestions and I will check them again. I have a Craftsman Auto ranging DMM that seems to work well but I may upgrade sooner than later.


I will have to get back to you again in a few days. Weekends are spoken for these days!


Take care,


Mark K.
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